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        <h1>Redux的基本使用</h1>
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    <a><i class="nexmoefont icon-calendar-fill"></i>2019年08月14日</a>
    <a><i class="nexmoefont icon-areachart"></i>517 字</a>
    <a><i class="nexmoefont icon-time-circle-fill"></i>大概 2 分钟</a>
    
      <a class="nexmoefont icon-appstore-fill -link" href="/categories/React/">React</a>
    
    
      <a class="nexmoefont icon-tag-fill -link" href="/tags/redux/">redux</a>
    
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  <article>
    <blockquote>
<p>Redux 是 JavaScript 状态容器，提供可预测化的状态管理。</p>
</blockquote>
<a id="more"></a>
<h3 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h3><p><img src="http://images.leegeing.cn/hexoImg/redux_01.png" alt="redux_01"></p>
<p>或者可以用图书馆案例来理解</p>
<p><img src="http://images.leegeing.cn/hexoImg/redux_02.png" alt="redux_02"></p>
<p><strong>图片来源与<a href="https://jspang.com/posts/2019/06/20/redux.html" target="_blank" rel="noopener">技术胖 jspang.com</a></strong></p>
<!-- more -->
<h3 id="安装-redux"><a href="#安装-redux" class="headerlink" title="安装 redux"></a>安装 redux</h3><ul>
<li>npm 安装</li>
</ul>
<pre><code class="JS">// npm 安装
npm install --save redux
</code></pre>
<ul>
<li>yarn 安装</li>
</ul>
<pre><code class="JS">// yarn 安装
yarn add redux
</code></pre>
<h3 id="创建-store-数据仓库"><a href="#创建-store-数据仓库" class="headerlink" title="创建 store 数据仓库"></a>创建 store 数据仓库</h3><p>安装好<code>redux</code>之后，在src目录下创建一个<code>store</code>文件夹,然后在文件夹下创建一个<code>index.js</code>文件。</p>
<pre><code class="JS">// index.js
import { createStore } from &#39;redux&#39;  // 引入createStore方法
const store = createStore()          // 创建数据存储仓库
export default store                 //暴露出去
</code></pre>
<p>再创建一个文件 <code>reducer.js</code> 文件用于管理数据</p>
<pre><code class="JS">// reducer.js
const defaultState = {}  //默认数据
export default (state = defaultState,action)=&gt;{  //就是一个方法函数
    return state
}
</code></pre>
<p>最后将在 <code>index.js</code> 中引入 <code>reducer.js</code></p>
<pre><code class="JS">// index.js
import reducer from &#39;./reducer&#39;
const store = createStore({
    reducer,
    //用于 redux dev tools 调试
    window.__REDUX_DEVTOOLS_EXTENSION__ &amp;&amp; window.__REDUX_DEVTOOLS_EXTENSION__()  
})
</code></pre>
<h3 id="在组件中使用仓库"><a href="#在组件中使用仓库" class="headerlink" title="在组件中使用仓库"></a>在组件中使用仓库</h3><h4 id="读取数据"><a href="#读取数据" class="headerlink" title="读取数据"></a>读取数据</h4><p>首先引入仓库，根据组件的位置不同，路径可能不太一样，根据实际需求来</p>
<pre><code class="JS">import store from &#39;./store/index&#39;
</code></pre>
<p>将仓库里的数据赋值给组件的 state 数据</p>
<pre><code class="JS">this.state=store.getState()
</code></pre>
<h4 id="修改数据"><a href="#修改数据" class="headerlink" title="修改数据"></a>修改数据</h4><p>想改变Redux里边State的值就要创建Action了。Action就是一个对象，这个对象一般有两个属性，第一个是对Action的描述，第二个是要改变的值。</p>
<pre><code class="JS">const action ={
    type:&#39;标识名称/方法名称&#39;,
    value:&#39;需要传递的参数&#39;
}
store.dispatch(action)
</code></pre>
<p>然后在 reducer.js 中去接收这个参数</p>
<pre><code class="JS">// reducer.js
export default (state = defaultState,action)=&gt;{
    if(action.type === &#39;标识名称/方法名称&#39;){

        let newState = JSON.parse(JSON.stringify(state)) // 深度拷贝state

        // action.value 是传递过来的参数
        newState.inputValue = action.value

        return newState
    }
    return state
}
</code></pre>
<p>做完这一步还不够，还需要让组件进行更新</p>
<pre><code class="JS">//----------关键代码-----------start
this.storeChange = this.storeChange.bind(this)  //转变this指向
store.subscribe(this.storeChange) //订阅Redux的状态
//----------关键代码-----------end

storeChange () {
    // 重新setState一次就可以实现组件也是变化的。在代码的最下方，编写storeChange方法。
    this.setState(store.getState())
}
</code></pre>
<p>🎉基础部分就是这样啦</p>

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